lspci -n says you do not have a wireless pci nic
ifconfig says you do have a working wireless nic but it is not working
ifconfig -a says you do have a wireless nic but it is not working
iwconfig says you do have a wireless nic but it is not working

if your wireless nic is usb it would explain the lspci result
if the wireless nic is usb the ifconfig result probably means that kernel driver(s) and/or firmware are not installed.